Chaelbs t



(No Model.)

0. T. HAM.

Lantern.

No. 230,873. Patented Aug. 10,1880.

- jazz/674.2 2.

UNITED STATES PATENT OFFICE.

CHARLES T. HAM, OF ROCHESTER, NEW YORK, ASSIGNOR OF ONE-HALF OF HISRIGHT TO'F. DE WITT CLARKE, OF SAME PLACE.

LANTERN.

SPECIFICATION forming part of Letters Patent No. 230,873, dated August10, 1880.

Application filed June 14, 1880. (No model.)

To all whom it may concern:

Be it known that I, CHARLES T. HAM, a citizen of the United States,residing at Roch ester, Monroe county, New York, have invented a certainnew and useful Improvement in Lanterns; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing bad to the accompanying drawings, in which Figure 1 is a sideelevation of a lantern, showing my improvement. Figs. 2 and 3 arecross-sections, respectively, in lines 00 w and y y, and on an enlargedscale.

My improvement relates to side-tube lanterns in which a cold draft isused.

The invention consists in an improved 'construction of the top of thelantern, whereby the device is rendered more effective, as hereinaftermore fully described.

In general features the lantern is of .ordi

nary construction.

A is the lamp. B is the globe or chimney. C G are the side tubes, and Dis the dome. On opposite sides of the dome are two cold- 2 5 airchambers, E E, into which the tops of the side tubes open, and thesechambers are fed with cold air through throats a a, on two oppositesides of the chamber, the same being separated by a vertical partition,I), which ex- 0 tends, however, but part way to the opening of the sidetube, the two throats uniting at that point in a common discharge overthe opening of the side tube, as clearly shown in Fig. 3.

5 Whichever way the lantern is moved, forward or back, the air willenter the throats on one side or the other and be fed to the side tube.

The top and bottom of the chamber areboth covered, and the only air thatenters passes 40 through the throats above described.

0 is a horizontal rim or disk which rests outside the dome D and dividesthe air-chamber centrally, extendinginto the throats a a as far as thepartition b, but not extending across 5 the common discharge at the endof the partition over the air-tube. In the up and down movements of thelantern this rim serves as a stop to the currents of air producedvertically, and deflects the same into the chamber,

so that whichever way the lantern is moved, forward or back or up ordown, it is sure to obtain a full supply of air. 7

Heretofore in lanterns of this kind difficulty has been experienced inproperly introducing haust in the side tubes.

To remedy these difficulties I employ, in combination with theair-chambersE E, the following peculiar arrangement: f f are curvedwings which form a continuation of thesides of the air-chamber, the sameextending out laterally and at some distance till they reach the outeredge of the rim 0. By this means a funnel shape is given to the throaton the inside and a concave shape is given on the outside, as shown inFig. 3. In moving the lantern forward and back these wings serve to givedirection to the currents and collect or concentrate them into the wedgeshaped throats, obviating the difficulty of introducing the air where asimple hole is made through the side. At the same time suchcountercurrents as come at right angles, striking the concave outersides of the wings, are deflected outward and backward, as indicated bythe half-arrows, and thereby are prevented from producing exhaust uponthe side tubes.

Having thus described my invention I claim- 1. In a side-tube lantern,the combination, with the air'ohamber E, provided with the throats a a,of the wings ff, extending out laterally in an angular direction,serving to direct and concentrate the direct currents into theair-chamber and to deflect and throw off the counter-currents, as hereinshown and described.

2. I11 a lantern, the combination of the airchamber E, provided withthroats a a, the wings f f, extending laterally from the same, thevertical partition I), separating the throats, and the horizontal rim ordisk 0, arranged cen- I00 trally around the chamber, as herein shown anddescribed.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

- Witnesses: 'CHARLES-T. HAM. R. F. Oseoon, JACOB SPAHN.

